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10
11#define EVDEV_MINOR_BASE 64
12#define EVDEV_MINORS 32
13#define EVDEV_BUFFER_SIZE 64
14
15#include <linux/poll.h>
16#include <linux/slab.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/input.h>
20#include <linux/major.h>
21#include <linux/device.h>
22#include <linux/compat.h>
23
24struct evdev {
25 int exist;
26 int open;
27 int minor;
28 char name[16];
29 struct input_handle handle;
30 wait_queue_head_t wait;
31 struct evdev_client *grab;
32 struct list_head client_list;
33 spinlock_t client_lock;
34 struct mutex mutex;
35 struct device dev;
36};
37
38struct evdev_client {
39 struct input_event buffer[EVDEV_BUFFER_SIZE];
40 int head;
41 int tail;
42 spinlock_t buffer_lock;
43 struct fasync_struct *fasync;
44 struct evdev *evdev;
45 struct list_head node;
46};
47
48static struct evdev *evdev_table[EVDEV_MINORS];
49static DEFINE_MUTEX(evdev_table_mutex);
50
51static void evdev_pass_event(struct evdev_client *client,
52 struct input_event *event)
53{
54
55
56
57 spin_lock(&client->buffer_lock);
58 client->buffer[client->head++] = *event;
59 client->head &= EVDEV_BUFFER_SIZE - 1;
60 spin_unlock(&client->buffer_lock);
61
62 kill_fasync(&client->fasync, SIGIO, POLL_IN);
63}
64
65
66
67
68static void evdev_event(struct input_handle *handle,
69 unsigned int type, unsigned int code, int value)
70{
71 struct evdev *evdev = handle->private;
72 struct evdev_client *client;
73 struct input_event event;
74
75 do_gettimeofday(&event.time);
76 event.type = type;
77 event.code = code;
78 event.value = value;
79
80 rcu_read_lock();
81
82 client = rcu_dereference(evdev->grab);
83 if (client)
84 evdev_pass_event(client, &event);
85 else
86 list_for_each_entry_rcu(client, &evdev->client_list, node)
87 evdev_pass_event(client, &event);
88
89 rcu_read_unlock();
90
91 wake_up_interruptible(&evdev->wait);
92}
93
94static int evdev_fasync(int fd, struct file *file, int on)
95{
96 struct evdev_client *client = file->private_data;
97 int retval;
98
99 retval = fasync_helper(fd, file, on, &client->fasync);
100
101 return retval < 0 ? retval : 0;
102}
103
104static int evdev_flush(struct file *file, fl_owner_t id)
105{
106 struct evdev_client *client = file->private_data;
107 struct evdev *evdev = client->evdev;
108 int retval;
109
110 retval = mutex_lock_interruptible(&evdev->mutex);
111 if (retval)
112 return retval;
113
114 if (!evdev->exist)
115 retval = -ENODEV;
116 else
117 retval = input_flush_device(&evdev->handle, file);
118
119 mutex_unlock(&evdev->mutex);
120 return retval;
121}
122
123static void evdev_free(struct device *dev)
124{
125 struct evdev *evdev = container_of(dev, struct evdev, dev);
126
127 kfree(evdev);
128}
129
130
131
132
133
134static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
135{
136 int error;
137
138 if (evdev->grab)
139 return -EBUSY;
140
141 error = input_grab_device(&evdev->handle);
142 if (error)
143 return error;
144
145 rcu_assign_pointer(evdev->grab, client);
146 synchronize_rcu();
147
148 return 0;
149}
150
151static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
152{
153 if (evdev->grab != client)
154 return -EINVAL;
155
156 rcu_assign_pointer(evdev->grab, NULL);
157 synchronize_rcu();
158 input_release_device(&evdev->handle);
159
160 return 0;
161}
162
163static void evdev_attach_client(struct evdev *evdev,
164 struct evdev_client *client)
165{
166 spin_lock(&evdev->client_lock);
167 list_add_tail_rcu(&client->node, &evdev->client_list);
168 spin_unlock(&evdev->client_lock);
169 synchronize_rcu();
170}
171
172static void evdev_detach_client(struct evdev *evdev,
173 struct evdev_client *client)
174{
175 spin_lock(&evdev->client_lock);
176 list_del_rcu(&client->node);
177 spin_unlock(&evdev->client_lock);
178 synchronize_rcu();
179}
180
181static int evdev_open_device(struct evdev *evdev)
182{
183 int retval;
184
185 retval = mutex_lock_interruptible(&evdev->mutex);
186 if (retval)
187 return retval;
188
189 if (!evdev->exist)
190 retval = -ENODEV;
191 else if (!evdev->open++) {
192 retval = input_open_device(&evdev->handle);
193 if (retval)
194 evdev->open--;
195 }
196
197 mutex_unlock(&evdev->mutex);
198 return retval;
199}
200
201static void evdev_close_device(struct evdev *evdev)
202{
203 mutex_lock(&evdev->mutex);
204
205 if (evdev->exist && !--evdev->open)
206 input_close_device(&evdev->handle);
207
208 mutex_unlock(&evdev->mutex);
209}
210
211
212
213
214
215static void evdev_hangup(struct evdev *evdev)
216{
217 struct evdev_client *client;
218
219 spin_lock(&evdev->client_lock);
220 list_for_each_entry(client, &evdev->client_list, node)
221 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
222 spin_unlock(&evdev->client_lock);
223
224 wake_up_interruptible(&evdev->wait);
225}
226
227static int evdev_release(struct inode *inode, struct file *file)
228{
229 struct evdev_client *client = file->private_data;
230 struct evdev *evdev = client->evdev;
231
232 mutex_lock(&evdev->mutex);
233 if (evdev->grab == client)
234 evdev_ungrab(evdev, client);
235 mutex_unlock(&evdev->mutex);
236
237 evdev_fasync(-1, file, 0);
238 evdev_detach_client(evdev, client);
239 kfree(client);
240
241 evdev_close_device(evdev);
242 put_device(&evdev->dev);
243
244 return 0;
245}
246
247static int evdev_open(struct inode *inode, struct file *file)
248{
249 struct evdev *evdev;
250 struct evdev_client *client;
251 int i = iminor(inode) - EVDEV_MINOR_BASE;
252 int error;
253
254 if (i >= EVDEV_MINORS)
255 return -ENODEV;
256
257 error = mutex_lock_interruptible(&evdev_table_mutex);
258 if (error)
259 return error;
260 evdev = evdev_table[i];
261 if (evdev)
262 get_device(&evdev->dev);
263 mutex_unlock(&evdev_table_mutex);
264
265 if (!evdev)
266 return -ENODEV;
267
268 client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL);
269 if (!client) {
270 error = -ENOMEM;
271 goto err_put_evdev;
272 }
273
274 spin_lock_init(&client->buffer_lock);
275 client->evdev = evdev;
276 evdev_attach_client(evdev, client);
277
278 error = evdev_open_device(evdev);
279 if (error)
280 goto err_free_client;
281
282 file->private_data = client;
283 return 0;
284
285 err_free_client:
286 evdev_detach_client(evdev, client);
287 kfree(client);
288 err_put_evdev:
289 put_device(&evdev->dev);
290 return error;
291}
292
293#ifdef CONFIG_COMPAT
294
295struct input_event_compat {
296 struct compat_timeval time;
297 __u16 type;
298 __u16 code;
299 __s32 value;
300};
301
302
303
304#ifdef CONFIG_X86_64
305# define COMPAT_TEST is_compat_task()
306#elif defined(CONFIG_IA64)
307# define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current))
308#elif defined(CONFIG_S390)
309# define COMPAT_TEST test_thread_flag(TIF_31BIT)
310#elif defined(CONFIG_MIPS)
311# define COMPAT_TEST test_thread_flag(TIF_32BIT_ADDR)
312#else
313# define COMPAT_TEST test_thread_flag(TIF_32BIT)
314#endif
315
316static inline size_t evdev_event_size(void)
317{
318 return COMPAT_TEST ?
319 sizeof(struct input_event_compat) : sizeof(struct input_event);
320}
321
322static int evdev_event_from_user(const char __user *buffer,
323 struct input_event *event)
324{
325 if (COMPAT_TEST) {
326 struct input_event_compat compat_event;
327
328 if (copy_from_user(&compat_event, buffer,
329 sizeof(struct input_event_compat)))
330 return -EFAULT;
331
332 event->time.tv_sec = compat_event.time.tv_sec;
333 event->time.tv_usec = compat_event.time.tv_usec;
334 event->type = compat_event.type;
335 event->code = compat_event.code;
336 event->value = compat_event.value;
337
338 } else {
339 if (copy_from_user(event, buffer, sizeof(struct input_event)))
340 return -EFAULT;
341 }
342
343 return 0;
344}
345
346static int evdev_event_to_user(char __user *buffer,
347 const struct input_event *event)
348{
349 if (COMPAT_TEST) {
350 struct input_event_compat compat_event;
351
352 compat_event.time.tv_sec = event->time.tv_sec;
353 compat_event.time.tv_usec = event->time.tv_usec;
354 compat_event.type = event->type;
355 compat_event.code = event->code;
356 compat_event.value = event->value;
357
358 if (copy_to_user(buffer, &compat_event,
359 sizeof(struct input_event_compat)))
360 return -EFAULT;
361
362 } else {
363 if (copy_to_user(buffer, event, sizeof(struct input_event)))
364 return -EFAULT;
365 }
366
367 return 0;
368}
369
370#else
371
372static inline size_t evdev_event_size(void)
373{
374 return sizeof(struct input_event);
375}
376
377static int evdev_event_from_user(const char __user *buffer,
378 struct input_event *event)
379{
380 if (copy_from_user(event, buffer, sizeof(struct input_event)))
381 return -EFAULT;
382
383 return 0;
384}
385
386static int evdev_event_to_user(char __user *buffer,
387 const struct input_event *event)
388{
389 if (copy_to_user(buffer, event, sizeof(struct input_event)))
390 return -EFAULT;
391
392 return 0;
393}
394
395#endif
396
397static ssize_t evdev_write(struct file *file, const char __user *buffer,
398 size_t count, loff_t *ppos)
399{
400 struct evdev_client *client = file->private_data;
401 struct evdev *evdev = client->evdev;
402 struct input_event event;
403 int retval;
404
405 retval = mutex_lock_interruptible(&evdev->mutex);
406 if (retval)
407 return retval;
408
409 if (!evdev->exist) {
410 retval = -ENODEV;
411 goto out;
412 }
413
414 while (retval < count) {
415
416 if (evdev_event_from_user(buffer + retval, &event)) {
417 retval = -EFAULT;
418 goto out;
419 }
420
421 input_inject_event(&evdev->handle,
422 event.type, event.code, event.value);
423 retval += evdev_event_size();
424 }
425
426 out:
427 mutex_unlock(&evdev->mutex);
428 return retval;
429}
430
431static int evdev_fetch_next_event(struct evdev_client *client,
432 struct input_event *event)
433{
434 int have_event;
435
436 spin_lock_irq(&client->buffer_lock);
437
438 have_event = client->head != client->tail;
439 if (have_event) {
440 *event = client->buffer[client->tail++];
441 client->tail &= EVDEV_BUFFER_SIZE - 1;
442 }
443
444 spin_unlock_irq(&client->buffer_lock);
445
446 return have_event;
447}
448
449static ssize_t evdev_read(struct file *file, char __user *buffer,
450 size_t count, loff_t *ppos)
451{
452 struct evdev_client *client = file->private_data;
453 struct evdev *evdev = client->evdev;
454 struct input_event event;
455 int retval;
456
457 if (count < evdev_event_size())
458 return -EINVAL;
459
460 if (client->head == client->tail && evdev->exist &&
461 (file->f_flags & O_NONBLOCK))
462 return -EAGAIN;
463
464 retval = wait_event_interruptible(evdev->wait,
465 client->head != client->tail || !evdev->exist);
466 if (retval)
467 return retval;
468
469 if (!evdev->exist)
470 return -ENODEV;
471
472 while (retval + evdev_event_size() <= count &&
473 evdev_fetch_next_event(client, &event)) {
474
475 if (evdev_event_to_user(buffer + retval, &event))
476 return -EFAULT;
477
478 retval += evdev_event_size();
479 }
480
481 return retval;
482}
483
484
485static unsigned int evdev_poll(struct file *file, poll_table *wait)
486{
487 struct evdev_client *client = file->private_data;
488 struct evdev *evdev = client->evdev;
489
490 poll_wait(file, &evdev->wait, wait);
491 return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
492 (evdev->exist ? 0 : (POLLHUP | POLLERR));
493}
494
495#ifdef CONFIG_COMPAT
496
497#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
498#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
499
500#ifdef __BIG_ENDIAN
501static int bits_to_user(unsigned long *bits, unsigned int maxbit,
502 unsigned int maxlen, void __user *p, int compat)
503{
504 int len, i;
505
506 if (compat) {
507 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
508 if (len > maxlen)
509 len = maxlen;
510
511 for (i = 0; i < len / sizeof(compat_long_t); i++)
512 if (copy_to_user((compat_long_t __user *) p + i,
513 (compat_long_t *) bits +
514 i + 1 - ((i % 2) << 1),
515 sizeof(compat_long_t)))
516 return -EFAULT;
517 } else {
518 len = BITS_TO_LONGS(maxbit) * sizeof(long);
519 if (len > maxlen)
520 len = maxlen;
521
522 if (copy_to_user(p, bits, len))
523 return -EFAULT;
524 }
525
526 return len;
527}
528#else
529static int bits_to_user(unsigned long *bits, unsigned int maxbit,
530 unsigned int maxlen, void __user *p, int compat)
531{
532 int len = compat ?
533 BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
534 BITS_TO_LONGS(maxbit) * sizeof(long);
535
536 if (len > maxlen)
537 len = maxlen;
538
539 return copy_to_user(p, bits, len) ? -EFAULT : len;
540}
541#endif
542
543#else
544
545static int bits_to_user(unsigned long *bits, unsigned int maxbit,
546 unsigned int maxlen, void __user *p, int compat)
547{
548 int len = BITS_TO_LONGS(maxbit) * sizeof(long);
549
550 if (len > maxlen)
551 len = maxlen;
552
553 return copy_to_user(p, bits, len) ? -EFAULT : len;
554}
555
556#endif
557
558static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
559{
560 int len;
561
562 if (!str)
563 return -ENOENT;
564
565 len = strlen(str) + 1;
566 if (len > maxlen)
567 len = maxlen;
568
569 return copy_to_user(p, str, len) ? -EFAULT : len;
570}
571
572static long evdev_do_ioctl(struct file *file, unsigned int cmd,
573 void __user *p, int compat_mode)
574{
575 struct evdev_client *client = file->private_data;
576 struct evdev *evdev = client->evdev;
577 struct input_dev *dev = evdev->handle.dev;
578 struct input_absinfo abs;
579 struct ff_effect effect;
580 int __user *ip = (int __user *)p;
581 int i, t, u, v;
582 int error;
583
584 switch (cmd) {
585
586 case EVIOCGVERSION:
587 return put_user(EV_VERSION, ip);
588
589 case EVIOCGID:
590 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
591 return -EFAULT;
592 return 0;
593
594 case EVIOCGREP:
595 if (!test_bit(EV_REP, dev->evbit))
596 return -ENOSYS;
597 if (put_user(dev->rep[REP_DELAY], ip))
598 return -EFAULT;
599 if (put_user(dev->rep[REP_PERIOD], ip + 1))
600 return -EFAULT;
601 return 0;
602
603 case EVIOCSREP:
604 if (!test_bit(EV_REP, dev->evbit))
605 return -ENOSYS;
606 if (get_user(u, ip))
607 return -EFAULT;
608 if (get_user(v, ip + 1))
609 return -EFAULT;
610
611 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
612 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
613
614 return 0;
615
616 case EVIOCGKEYCODE:
617 if (get_user(t, ip))
618 return -EFAULT;
619
620 error = dev->getkeycode(dev, t, &v);
621 if (error)
622 return error;
623
624 if (put_user(v, ip + 1))
625 return -EFAULT;
626
627 return 0;
628
629 case EVIOCSKEYCODE:
630 if (get_user(t, ip) || get_user(v, ip + 1))
631 return -EFAULT;
632
633 return dev->setkeycode(dev, t, v);
634
635 case EVIOCSFF:
636 if (copy_from_user(&effect, p, sizeof(effect)))
637 return -EFAULT;
638
639 error = input_ff_upload(dev, &effect, file);
640
641 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
642 return -EFAULT;
643
644 return error;
645
646 case EVIOCRMFF:
647 return input_ff_erase(dev, (int)(unsigned long) p, file);
648
649 case EVIOCGEFFECTS:
650 i = test_bit(EV_FF, dev->evbit) ?
651 dev->ff->max_effects : 0;
652 if (put_user(i, ip))
653 return -EFAULT;
654 return 0;
655
656 case EVIOCGRAB:
657 if (p)
658 return evdev_grab(evdev, client);
659 else
660 return evdev_ungrab(evdev, client);
661
662 default:
663
664 if (_IOC_TYPE(cmd) != 'E')
665 return -EINVAL;
666
667 if (_IOC_DIR(cmd) == _IOC_READ) {
668
669 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) {
670
671 unsigned long *bits;
672 int len;
673
674 switch (_IOC_NR(cmd) & EV_MAX) {
675
676 case 0: bits = dev->evbit; len = EV_MAX; break;
677 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
678 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
679 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
680 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
681 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
682 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
683 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
684 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
685 default: return -EINVAL;
686 }
687 return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
688 }
689
690 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
691 return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
692 p, compat_mode);
693
694 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
695 return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
696 p, compat_mode);
697
698 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
699 return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
700 p, compat_mode);
701
702 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
703 return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
704 p, compat_mode);
705
706 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
707 return str_to_user(dev->name, _IOC_SIZE(cmd), p);
708
709 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
710 return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
711
712 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
713 return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
714
715 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
716
717 t = _IOC_NR(cmd) & ABS_MAX;
718
719 abs.value = dev->abs[t];
720 abs.minimum = dev->absmin[t];
721 abs.maximum = dev->absmax[t];
722 abs.fuzz = dev->absfuzz[t];
723 abs.flat = dev->absflat[t];
724
725 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
726 return -EFAULT;
727
728 return 0;
729 }
730
731 }
732
733 if (_IOC_DIR(cmd) == _IOC_WRITE) {
734
735 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
736
737 t = _IOC_NR(cmd) & ABS_MAX;
738
739 if (copy_from_user(&abs, p,
740 sizeof(struct input_absinfo)))
741 return -EFAULT;
742
743
744
745
746
747
748 spin_lock_irq(&dev->event_lock);
749
750 dev->abs[t] = abs.value;
751 dev->absmin[t] = abs.minimum;
752 dev->absmax[t] = abs.maximum;
753 dev->absfuzz[t] = abs.fuzz;
754 dev->absflat[t] = abs.flat;
755
756 spin_unlock_irq(&dev->event_lock);
757
758 return 0;
759 }
760 }
761 }
762 return -EINVAL;
763}
764
765static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
766 void __user *p, int compat_mode)
767{
768 struct evdev_client *client = file->private_data;
769 struct evdev *evdev = client->evdev;
770 int retval;
771
772 retval = mutex_lock_interruptible(&evdev->mutex);
773 if (retval)
774 return retval;
775
776 if (!evdev->exist) {
777 retval = -ENODEV;
778 goto out;
779 }
780
781 retval = evdev_do_ioctl(file, cmd, p, compat_mode);
782
783 out:
784 mutex_unlock(&evdev->mutex);
785 return retval;
786}
787
788static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
789{
790 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
791}
792
793#ifdef CONFIG_COMPAT
794static long evdev_ioctl_compat(struct file *file,
795 unsigned int cmd, unsigned long arg)
796{
797 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
798}
799#endif
800
801static const struct file_operations evdev_fops = {
802 .owner = THIS_MODULE,
803 .read = evdev_read,
804 .write = evdev_write,
805 .poll = evdev_poll,
806 .open = evdev_open,
807 .release = evdev_release,
808 .unlocked_ioctl = evdev_ioctl,
809#ifdef CONFIG_COMPAT
810 .compat_ioctl = evdev_ioctl_compat,
811#endif
812 .fasync = evdev_fasync,
813 .flush = evdev_flush
814};
815
816static int evdev_install_chrdev(struct evdev *evdev)
817{
818
819
820
821
822 evdev_table[evdev->minor] = evdev;
823 return 0;
824}
825
826static void evdev_remove_chrdev(struct evdev *evdev)
827{
828
829
830
831 mutex_lock(&evdev_table_mutex);
832 evdev_table[evdev->minor] = NULL;
833 mutex_unlock(&evdev_table_mutex);
834}
835
836
837
838
839
840
841static void evdev_mark_dead(struct evdev *evdev)
842{
843 mutex_lock(&evdev->mutex);
844 evdev->exist = 0;
845 mutex_unlock(&evdev->mutex);
846}
847
848static void evdev_cleanup(struct evdev *evdev)
849{
850 struct input_handle *handle = &evdev->handle;
851
852 evdev_mark_dead(evdev);
853 evdev_hangup(evdev);
854 evdev_remove_chrdev(evdev);
855
856
857 if (evdev->open) {
858 input_flush_device(handle, NULL);
859 input_close_device(handle);
860 }
861}
862
863
864
865
866
867static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
868 const struct input_device_id *id)
869{
870 struct evdev *evdev;
871 int minor;
872 int error;
873
874 for (minor = 0; minor < EVDEV_MINORS; minor++)
875 if (!evdev_table[minor])
876 break;
877
878 if (minor == EVDEV_MINORS) {
879 printk(KERN_ERR "evdev: no more free evdev devices\n");
880 return -ENFILE;
881 }
882
883 evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
884 if (!evdev)
885 return -ENOMEM;
886
887 INIT_LIST_HEAD(&evdev->client_list);
888 spin_lock_init(&evdev->client_lock);
889 mutex_init(&evdev->mutex);
890 init_waitqueue_head(&evdev->wait);
891
892 snprintf(evdev->name, sizeof(evdev->name), "event%d", minor);
893 evdev->exist = 1;
894 evdev->minor = minor;
895
896 evdev->handle.dev = dev;
897 evdev->handle.name = evdev->name;
898 evdev->handle.handler = handler;
899 evdev->handle.private = evdev;
900
901 strlcpy(evdev->dev.bus_id, evdev->name, sizeof(evdev->dev.bus_id));
902 evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
903 evdev->dev.class = &input_class;
904 evdev->dev.parent = &dev->dev;
905 evdev->dev.release = evdev_free;
906 device_initialize(&evdev->dev);
907
908 error = input_register_handle(&evdev->handle);
909 if (error)
910 goto err_free_evdev;
911
912 error = evdev_install_chrdev(evdev);
913 if (error)
914 goto err_unregister_handle;
915
916 error = device_add(&evdev->dev);
917 if (error)
918 goto err_cleanup_evdev;
919
920 return 0;
921
922 err_cleanup_evdev:
923 evdev_cleanup(evdev);
924 err_unregister_handle:
925 input_unregister_handle(&evdev->handle);
926 err_free_evdev:
927 put_device(&evdev->dev);
928 return error;
929}
930
931static void evdev_disconnect(struct input_handle *handle)
932{
933 struct evdev *evdev = handle->private;
934
935 device_del(&evdev->dev);
936 evdev_cleanup(evdev);
937 input_unregister_handle(handle);
938 put_device(&evdev->dev);
939}
940
941static const struct input_device_id evdev_ids[] = {
942 { .driver_info = 1 },
943 { },
944};
945
946MODULE_DEVICE_TABLE(input, evdev_ids);
947
948static struct input_handler evdev_handler = {
949 .event = evdev_event,
950 .connect = evdev_connect,
951 .disconnect = evdev_disconnect,
952 .fops = &evdev_fops,
953 .minor = EVDEV_MINOR_BASE,
954 .name = "evdev",
955 .id_table = evdev_ids,
956};
957
958static int __init evdev_init(void)
959{
960 return input_register_handler(&evdev_handler);
961}
962
963static void __exit evdev_exit(void)
964{
965 input_unregister_handler(&evdev_handler);
966}
967
968module_init(evdev_init);
969module_exit(evdev_exit);
970
971MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
972MODULE_DESCRIPTION("Input driver event char devices");
973MODULE_LICENSE("GPL");
974
